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- W4293314314 abstract "Organic optoelectronic conversion possesses various advantages such as low cost and tunable light sensing, but organic semiconductors suffer from significant drawbacks, such as instability in air and low carrier mobility. To overcome them, we recently proposed a [metal (M)|insulator (I)|semiconductor (S)|insulator (I)|metal (M)] structure (MISIM photocells) that can effectively induce photo-induced displacement current without any passage of carriers through the S|I and I|M interfaces. In the present work, we investigated the duty-cycle dependence of MISIM photocells, to determine the guiding principles for improving the speed and efficiency of the optoelectronic conversion toward its practical application. We formed an MISIM photocell consisting of a bilayer of zinc phthalocyanine (ZnPc) and fullerene (C60) as the S layer and parylene C (PC) as the I layers, and tested the dependence of the photocurrent on the duty cycle D = tON/(tON + tOFF), where tON and tOFF are the light illumination and blocking times, respectively, in one cycle under light modulation. By independently changing tON and tOFF in the range of 0.2–2.0 μs, the rise time of the transient photocurrent was found to be improved by approximately 30% by the duty cycle. We also revealed that the charge carriers Q generated in one cycle reached their maximum at D ≈ 0.4, and the time average increased gradually with an increase in modulation frequency. This feature of Q was well explained by a theoretical model for the MISIM photocells." @default.
- W4293314314 created "2022-08-27" @default.
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- W4293314314 date "2022-10-01" @default.
- W4293314314 modified "2023-10-18" @default.
- W4293314314 title "Duty-cycle dependence of photo-induced displacement current in MISIM photocells" @default.
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- W4293314314 doi "https://doi.org/10.1016/j.orgel.2022.106632" @default.
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